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        <h2 id="开发QT桌面应用时遇到的问题"><a href="#开发QT桌面应用时遇到的问题" class="headerlink" title="开发QT桌面应用时遇到的问题"></a>开发QT桌面应用时遇到的问题</h2><h3 id="一、堆溢出的问题"><a href="#一、堆溢出的问题" class="headerlink" title="一、堆溢出的问题"></a>一、堆溢出的问题</h3><p><img src="//desperadoccy.github.io/2019/04/27/QTwork/3.png" alt="image text"></p>
<p>百思不得其解，由于是堆溢出的问题，第一个想到的是堆空间没有及时释放，即析构函数没有写好。然后去请教了一下曹师傅，曹师傅说堆溢出的原因就两个，一个是内存分配，一个是缓冲区问题。由于缓冲区不太明白是什么东西，所以自作主张认定是内存分配问题了。但是千改忘改都没有用，偶然之下，我移除了原本的背景音乐文件，结果就能跑了。<br><a id="more"></a><br>=_=……</p>
<p><img src="//desperadoccy.github.io/2019/04/27/QTwork/2.png" alt="image text"></p>
<hr>
<p>缓冲区问题</p>
<h3 id="二、中文问题"><a href="#二、中文问题" class="headerlink" title="二、中文问题"></a>二、中文问题</h3><p>未解决</p>
<p><img src="//desperadoccy.github.io/2019/04/27/QTwork/5.png" alt="image text"></p>
<p><img src="//desperadoccy.github.io/2019/04/27/QTwork/4.png" alt="image text"></p>
<p>将“ ”中的中文改为英文就能跑了，原因未找到。</p>
<h3 id="三、sql数据库的链接问题"><a href="#三、sql数据库的链接问题" class="headerlink" title="三、sql数据库的链接问题"></a>三、sql数据库的链接问题</h3><p>这个问题让我困扰了10个小时，百度了无数种方法，下载了各种包，都没有起效。结果问题就是因为QT不支持sql8.0!!!所以当qmysql驱动不能加载时，我将mysql8.0的libmysql.dll文件复制到编译器 bin 下是无用的！！！</p>
<hr>
<p>解决方法：下载mysql5.7版本，并移植动态链接库到qt中，即可运行驱动。</p>
<h3 id="四、一个有趣小bug（中文）"><a href="#四、一个有趣小bug（中文）" class="headerlink" title="四、一个有趣小bug（中文）"></a>四、一个有趣小bug（中文）</h3><p>编译器对中文的支持一直是让人头疼的问题，在开发过程中遇到每行最后一个汉字显示不出来的问题。<br><img src="//desperadoccy.github.io/2019/04/27/QTwork/6.png" alt></p>
<p><img src="//desperadoccy.github.io/2019/04/27/QTwork/7.png" alt></p>
<p>所以我只能把最后一个中文汉字转为中文|，这也就导致了这有两处非常突兀的竖线。</p>
<hr>
<p>解决方案：将问题二和问题四结合起来思考，当我们在问题二里的字符串最后多敲一个空格，编译器不会报错，进而出现问题四（QAQ，无法复现bug）。如此一想，我们便可以想到中文编码的问题，中文在计算机中占两个字节，而程序出现了吞字现象，可能的原因只有编码冲突（Windows使用gbk，QT使用utf-8）。上网百度了一下方法。如图：<br><img src="//desperadoccy.github.io/2019/04/27/QTwork/8.png" alt></p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#开发QT桌面应用时遇到的问题"><span class="nav-number">1.</span> <span class="nav-text">开发QT桌面应用时遇到的问题</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#一、堆溢出的问题"><span class="nav-number">1.1.</span> <span class="nav-text">一、堆溢出的问题</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#二、中文问题"><span class="nav-number">1.2.</span> <span class="nav-text">二、中文问题</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#三、sql数据库的链接问题"><span class="nav-number">1.3.</span> <span class="nav-text">三、sql数据库的链接问题</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#四、一个有趣小bug（中文）"><span class="nav-number">1.4.</span> <span class="nav-text">四、一个有趣小bug（中文）</span></a></li></ol></li></ol></div>
            

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  <script type="text/javascript">
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url);
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

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